| Acronym | Definition |
|---|
| MMSB➣Multi Materials Stewardship Board (est. 1996; St. John's, Newfoundland and Labrador, Canada; Ministry of Environment and Conservation) |
| MMSB➣Memoriae Mundi Series Bohemica (est. 1995; digital heritage program; Czech Republic) |
| MMSB➣Department of Molecular, Microbial and Structural Biology (University of Connecticut Health Center; Farmington, CT) |
| MMSB➣Multiple Message Switch Buffer (Sprint) |
| MMSB➣Methyl-Methionine Sulphonium Bromide (pharmacology) |